How to migrate a flex app from Flex Builder 3 to Flash Builder 4.7

Question

Hello,
I have written an extensive application using Flex Builder 3. I have maintained the app for several years using FB3. In the mean time I have created several mobile apps using Flash Builder 4.7. So I am very familiar with the the new framework. However, my client has requested some big changes to the app. I figured this would be a great opportunity to migrate the app to FB4.7. I would like to keep the mx structure for the time being. So, are there any good documents concerning this migration path? What SDK should I use. Should I start using the Apache Flex SDK?
Thanks,
--randu

Answer 1

Hello Raja,
Thanks. Your reply has been very helpful.
For deploying the Flex app, as a web on NW 04S, I did the following:
- Created a web project and included the following files as web-content. These files were created using the Flex builder or in the Flex development perspective of NWDI - CE, you can find them in the "bin" folder of your Flex project.
   - AC_OETags.js
   - your-app.html
   - your-app.swf
   - history.htm
   - history.js
   - history.swf
   - playerProductInstall.swf
   - crossdomain.xml - This file is important, if our Flex app wants data from the server.
    ( I made the simplest possible crossdomain.xml containing
       <allow-access-from domain="*" secure = "false"/>
  -  Declare "your-app.htm" as the welcome file in web.xml
  -  Package, this .war after building this web project in an Enterprise application project and build it.
  Now, you have the .ear made, which is deployable on your NW Web AS.
Apart from this, another thing which is important to be included in your Flex mxml code is the following:
( Thanks to Abesh for this........ )
- You have to tell the Flex app, in the action script, as to from where should the Flash engine pick the crossdomain.xml ( in case you are accessing the server for data from your app)
You might have noticed, we packaged the crossdomain.xml along with our other web content in the .war.
So mention, something like this in your action script.
Security.loadPolicyFile("http://<hostname>:<http-port>/<context-root fo your web app>/crossdomain.xml");
The code will work like a charm.
Hope this helps everyone.
Thanks guys.
Best Regards, Gagan.